This is the Replacement Flex Shaft Housing for the OS 21-XM Marine engine. This part covers the flexible shaft. FEATURES: Plastic construction INCLUDES: One Shaft tube SPECS: Length: 100mm (3.94") Diameter: 5.5mm (0.22") COMMENTS: For the flexible shaft, use OSMG5862. For the flexible shaft assembly, use OSMG5860. cmc 01/13/02 ir/kh